I thought I'd share some of my own designs for everyone's enjoyment/edification...
Barrage class Gunship
The Barrage is a defensive design I created to counter SJ's assault on my base in the seemingly neverending Fab Three game. It was based on one of SJ's designs, the Inferno, though unlike the Inferno it lacks a reactor. It boasts high firepower at long range, and a large reserve of energy, though it is not very fast or maneuverable. Several Barrages were able to significantly weaken SJ's cobbled-together Vorcha class cruiser, which has a massive amount of shielding and was the bane of entire fleets earlier in the game.
Cockroach class Fighter
The Cockroach was one of the first designs I created in Fab Three. It's not very strong or fast, but it can turn about reasonably well, and has surprisingly strong defenses for a ship its size. It was used early on for harassing the enemy, and later for point defense vs. missiles.
D'Deridex class Battleship
I created the D'Deridex for a round-robin battleship tournament between myself, SJ, and se5a. Each of us was pitted against each of the other two players in a game in which we got two of our own design and one of the design created by the player who was not participating in that game. The D'Deridex, of course, is inspired by the Romulan warbirds from Star Trek: The Next Generation. It boasts high maneuverability and forward/rear acceleration, especially for a ship its size, though the strafe thrust leaves something to be desired - not that that's much of a problem with the heavy laser turrets pointing in practically every direction and the aforementioned high turn rate. Sadly, I lost both of my games. Incidentally, SJ's design was the Tunguska, a perfectly symmetrical triangular design inspired by Schlock Mercenary (I dubbed it the "Triforce"), while se5a's design was an impractical-looking design with a detachable medium fabricator, which turned out to be more practical than it looked due to its high speed without the fabber attached. I did destroy se5a's fabber early on, at least!
Hyaaah! class Frigate
Continuing on with the Zelda theme, this is the design I used in a similar game vs. dumbluck, in which we each got two of our own design and one of the opponent's. Due to it being a basic melee and not a fabber war, I decided not to install a reactor. Unfortunately, dumbluck did install a reactor on his design, and his was faster, so he could have simply outrun me and waited several hundred turns for my batteries to die. Fortunately, he was sporting and did not do so. Unfortunately, he won the battle anyway. As for the design itself, it boasts incredibly high turn rate - it can spin to any facing in one turn. For this reason it has only forward facing weaponry. Kind of reminds you of Link, doesn't it?
I do wish I had installed two heavy lasers, though, instead of a heavy and a turbo - no point in carrying a shorter ranged weapon if you're going to be staying at long range, and no point having a longer ranged weapon that does less DPS if you're going to close in!
Kirby class Gunship
I think you can tell by now that I like Nintendo games
The Kirby is named for its ability to absorb energy from weapons fire using its nearly complete coating of absorption armor, then fire it back using its lasers. It's not very fast or maneuverable, and even the firepower leaves a bit to be desired, but man is it sturdy!
Newcombe class Missile
Named after Duke Nukem (if he were British), the Newcombe is an armored missile capable of soaking PD fire. It's even shaped like a mushroom cloud, too! Just be careful where you aim it, because the turn rate is horrendous.
Sapper class Drone
The Sapper is an EMP drone designed to get in quick and disable enemy shields. It's equipped with absorption armor to soak PD fire (as well as replenish its energy a bit from the EMP blast), and it has excellent strafe thrust to track down elusive targets.
Sniper class Fighter
The Sniper is a fighter designed not for dogfighting, but for long-range engagements. It's not very fast, but it doesn't need to be - it just sits at maximum range and snipes away from behind its armor plate with its medium laser. Some Snipers I refitted with absorption coatings for added protection, though that did slow them down further. I do wish I had included some retro thrust, though... retreat is very important when you're a long range attacker!
Swiss Army Knife class Base Expander
The Swiss Army Knife is a generic connector module for constructing addons to bases. It has three each of the best class docking ports and docking clamps for maximum versatility, as well as a bridge to add to your base's repair capacity (though due to the lack of capacitors, you will need to manually enable the bridge after connecting the module).
Wrangler class Mobile Recycler
The Wrangler is a mobile recycler ship based on SJ's Cowboy design. It has high maneuverability and acceleration for tracking down fast-moving debris - as well as for quickly escaping from a battle zone! Since it is too large to fit in a drydock, it is equipped with a docking port, so you can dock it to your base even without an expensive spacedock.
ZapSat class Defense Satellite
Another design from early in Fab Three, the ZapSat (name swiped from Star Control) is a defensive satellite designed to shoot down enemy missiles. It has one laser pointing in all but one direction, so it doesn't need much in the way of maneuverability. Depsite having five lasers, it does have only for CNC points, though, so it cannot fire all of them at once. The ZapSat has no defenses, but it is very small, so only lighter weapons and missiles will have much of a chance of damaging it.