Pretty sure there’s a ton of guitar effects builders out there that would be happy to buy those diodes and transistors from you 
These components may not be that useful for “classic” synth stuff (unlike the ICs), but if you’re into noise and distortion you can have a lot of fun with them.
(basically, any circuit with diodes in the signal path can benefit from having a big pile of diodes to play with, see e.g. the schematics here).