Yes I thought a real cactus would be bad news. I don't want my baby hurt.
I like the idea of the vinyl, just for the ease of cleaning. Can get them from me local DIY shop. I also like the sand stone idea, would I maby be able to use slate? Maby broken up in smal pieces to scatter the floor (SHarp pieces taken off of course).
I also had an idea, wether it would look good or not is another story but no harm in trying. If I found out wich crystals came from Pakistan, etc I could put them in the tank. I already in the tank he has put a large piece of Rose Quartz in (not from the area I think, but still looks nice, and he loves climbing over it and laying on it as it holds heat quite nicely, but also move it to a cooler place in viv where he leaves it alone lol.
Wether this idea would look good or not, I haven't the foggiest, but no harm in trying it out, and if it don't look right then take it out

If I use clay, it will be hard, but I make alot of things out of clay so I find clay really easy to use... it's just patience and planning in advance with claw specially air drying clay... may try to get that that stuff if I can get it from ebay in the quantaty I want and at a reasonable price... other wies I'll make a few minitures an try differnt substrates. The clay would be a git to clean, so if I can I'll stay away from it.
Mouths just got a starter viv, and it's not big enough for him.... his a big boy, (although he may be a she if I've sexed him/her right lol... give it a few more months and then try sexing again)
I'm planning on getting a larger viv for him, so will do the redecoration in there... but he may not go in there till after christmas as it's his crimbo pressie lol.... so have plenty of time to make sure I get it right and most importantly.... safe.