>>7225086Use LDD or
Stud.io to digitally build your MOCs without the constrain of part and color limits, anon. I struggled with the exact same feeling earlier this year when I first got back into Lego, being able to plan them out in advance is incredibly helpful.
Also, if you just want a small varied bundle of parts to play around with without having to go through Ebay or Craigslist, get pic related.