The most I spoil my S7 is slightly better treatment than the migrants. The XL get's the royal treatment, minus the magma because he's a proper noble worthy of living. After all, he/she puts up with the colony since the beginning.
Considering the extra work as well, they need the best quarters to get everything done. Pretty much, define snazzy.
Well, in the case of my latest trends of building:
My last successful fort (IE- still alive after 5 years with a functional setup and epic dining room)
Wavehandle: I had a special setup made. It forked outward providing more than enough room, spread across a 2D plane.
Commoners = 2x2 rooms (the longer you stayed, the closer to the main hall, and better quality (engraved high-value basic) walls and floors, and even furniture you get).
Nobles = 7x7 full engraved room, starting with high-val-basic (IE- Chalk, Marble, etc.) out. As well as having your own mausoleum at the end of the hall. The rooms are locked post-mortem. Less-worthy nobles get the microcline rooms.
Funny enough, my philosopher only has a bed in the middle of a masterwork engraved chalk room. What can I say; my dwarves love this guy. He's in the ether.
As for rooms that follow a more radial format; they get the big corner rooms, instead of the smaller hall rooms. Basically, they live in walk-in closets, compared to alcoves the others live in.