The Xenofex filters (a good buy for lots of reasons) include a Baked Earth which has a Cracked Paint setting, and a Crumpled. Baked Earth is good for a network of cracks, but all flakes remain flat with no color variation. Crumpled looks less flakey but more 3-D, with color variation from flake to flake. Both settings have options to tweak, lots of possibilities.

Bill