I wouldn't say no to any gun! Better question is 'what would I gracefully accept, despite its ugliness, and then immediately put up for sale to get it the hell out of my safe': a bunch of those come to mind!
Chiappa Rhino (or Mateba Auto Revolver, which looks really similar)
Type 14 Nambu (ugh!) or Type 94 Nambu
Dreyse 1907
Hi Point
Frommer M37 or 'stop'
Erika 4.25mm
Tokarev
Luger (sorry, they're ugly!)
FP45 Liberator
Beretta Neos
Colt 1902
any gold or gold-striped Desert Eagle. Or anything gold or gold striped, for that matter.
With the above in mind... if I couldn't sell them, everything in the list above would be worthless to me, and just taking up space in the safe... except the gold tiger-striped desert eagle (which I could have refinished) and the Neos, which I could at least let new shooters use!