I hide white chocolate chips or plain cheerios in mine. Doesn't seem to matter where I hide things, they find them.
They will explore everything from the basket to the stuff in it. I usually have 2 baskets. One has pompoms and small fleece scraps (like 1/2 inch by 2 inch pieces) and the other has plastic ping pong balls. I think they like things to forage through and also that make noise, as long as it's not loud noise. Putting a toy that makes noise if you hit a button will probably not be a good idea. But beads on strings and stuff like that are good. Plastic easter eggs work well too. I'm going to start on some easter stuff and change out their toys.
I took some fleece and sewed a plastic grocery bag inside two layers and made a semi-tunnel. I was afraid to make a solid tunnel because I didn't know if the tunnel would get too warm because of the plastic or if they'd get stuck and suffocate (probably being paranoid) so I just folded the material in half and stitched the two ends. They can go in the openings in the ends, or climb in and out from the top. I think they like the crunching noise it makes when they get in it. I can tell in the mornings that they had played in it because the fabric and mishapen a bit.
I am going to start trying to post small tutorials when I make things to help others out.
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