Hello everyone, there are really some great ideas here and I will try some of them that I haven't thought of! And that kneebouncers site looks awesome!
I've given my lo a cordless phone receiver that's not in use, she really likes it as it looks like the one mummy uses! We also have an old remote (my friends concur that the real thing is better than the toy ones, they seem to know when you're trying to 'con' them with a toy version!). She loves my slippers and will commando on her belly (7mos) across the room to get at them, so I've given her a pair of her own soft shoes to play with and chew. She still comes after mine but plays with hers too.
She also loves clothes - when I dress her I drop something on her and she loves it, and then I start a game of where's baby by dropping it over her face and she pulls it off. So in her play area I leave socks, pants and tops for her to roll around with.
One thing she also likes is individual links that used to hang her toys on the gymini. She enjoys just one, or several linked together - she shakes them in one hand (when not too long).