Well, a couple of weeks back I managed to pick up a pack of small bugs for £1 (from the local Poundland store)...
...and, admittedly, on their own they don't look like anything special:
The ant, maggot, and spider
But after super-gluing* them to some small mdf bases, 'flocking' those bases with the same cheap bird sand & grit that I used HERE, and giving them a quick coat of paint ...the finial result isn't so bad:
*note that I glued the 'feet' down individually, in order to reposition the legs slightly, and thus, get a slightly better pose ...as can be seen on the finished spider miniature.
And, if you're thinking of creating a bunch of these yourself ...perhaps for use in an Age of Shadow encounter ...then I've also put together a quick monster description and statblock that will allow you to do just that :)