I've started using some rollers I found on ebay to make scenic bases, for those that don't know what Im talking about
http://www.ebay.com/itm/Rolling-Pin-small-COBBLESTONE-Texture-Create-your-bases-Warhammer-Bolt-Action/282173038214?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 is one of the versions the seller has.
I've done a few bases for far, and they have worked pretty well, I spread some greenstuff on the base, roll the rolling pin over it and then push the mini into the greenstuff just enough to stick and hold, but not so much it distorts the putty. The problem I'm having is painting the base. I'd like to make the base, paint it, then put the mini onto the completed base, so I'm wondering if anyone has any experience in attaching minis to hardened greenstuff, and what's the best 'glue' to use.