heres my attempt for you, I apologize for it taking me so long Diolma. there is one drawback here, I used a layered texture and not just one channel but many. meaning there are two cubes, one slightly smaller being the bump-mapped cube and the larger being a transparent texture (with more bump) to increase crustiness and control more coloring. SO it renders slowly, but i'm only on an Athlon 2100 here, with a pathetic 3/4GB of RAM. and I had Photoshop and a dozen work-related apps running, so that surely contributed to a 3-hour render time for this picture. it maps okay and can be scaled to fit multiple surface-types, if necessary. it was fun for me though since Bryce isn't node-based like Maya, the ease of use with the Materials Lab for example works on a per-object basis, and not a per-material-node basis, and in some cases lets you work much faster! i forget how fun the DTE can be sometimes... anyway, I hope you like it and if you want I can email you the material so you can pick it apart. don't feel obligated, but it's here if you want it!