I have a few machines that I'll
occasionally just sit and
 admire, mainly the NeXT and the SOL-20 but on an asthetic level I
 tend to find specific boards just as pleasing to look at as various
 machines.  There's just something about a well planned, well layed
 out design, such as the mainboard of the Apple II or II+ or the
 minimalist approach taken by the ZX-81.  Amiga Zorro II/III boards
 tend to be well layed out as well due to thier size. 
George Morrow's board designs always did this for me; I have an
EconoRAM III 16K dynamic board and an early WunderBUSS in an
Objective Design extruded aluminum frame.
Which reminds me: has anyone written up the electrolytic capacitor
reconditioning instruction into a FAQ?
-dq