A while back I asked about stuffing a wooden tunnel/tube type thing that Luna is too big for. Well, this is what I've been doing -
I bought some Dandelion stuff from Wilko's, turns out Luna doesnt really like it. So I put mealworms and a herb mix that she loves inside the tunnel then stuffed the holes with the dandelion stuff - she has to pull out and dig through the dandelion to get to the stuff she likes.
This is the tunnel I have used
Happy Pet Hamster Adventure Tunnel on eBay (end time 20-Mar-11 21:15:04 GMT) I expect that a toilet roll tube could be used in a similar way.
I'm uploading a video of her digging in one at the mo, will post it when its done