Over the last couple of years, I've become increasingly irked by the concept of wealth by level, and treasure by challenge rating existent in 3.x and later editions of D&D. I mean, sure, it might be good game balance, but it leads to situations where the average goblin is walking around with more wealth then a dozen peasants.
Which is why, when I first saw it, I was quite enamored with the Basic/OD&D idea of giving each monster a rated treasure type, dependent on who likely it was to actually collect loot. You would look up the type on a table, and roll to see whether it had any of a variety of things. Sometimes you got nothing, sometimes you got a huge horde. Of course, this was back before you could, let alone needed to buy magic items, so a heap of coin wasn't quite as useful, and it wasn't such a huge deal if a bunch of 1st-level characters found 15,000 gold coins in a goblin den.
Of course, after a while, I started to find some drawbacks to the system - the rating was per lair of monsters, which meant getting treasure for smaller bands was fiddly, and the whole thing required tables to be looked up. I wanted something simpler.
So, here I present a compromise. It's a sort of homogenized version of all the assorted treasure types collected by most humanoid (or humanoid-ish) critters in basic D&D, and comes out pretty close on an average-value-per-hit-dice-of-monster comparison.
For every 13 hit dice (give or take) of monsters in a dungeon, roll once for each category. The % numbers are the likelyhood that type of treasure will be found. The number after that is how much/many of that treasure type will be found.