Mine love fresh sweetcorn on a cob, they go mad for it O0 I got it from Lidls, Tescos or the market, and it's gone in no time O0 I tend to go for the ones with green bits. (Talking about corn on the cob has just given me a craving!)
I must admit I don't feed commerical treats either as I don't agree with them. I was having a discussion in a pet shop earlier about artifial colours in feeds and how daft it is that they are added.