Example - source diffuse texture from cgtextures.com.
Crazybump/UE3 from diffuse map


Crazybump/UE3 from painted bumpmap


Steps:
1) Diffuse map:

2) Paint the bump (or the cavity/convexity) mask over diffuse map:

3) Blend the mask with diffuse map to get the bump map that has large and fine details:

4) Generate normal map and enhance it in CB:

Such painted masks can be used for parallax maps, specular masks and blending masks, so the time spent on the painting process won't be totally lost.
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