one thing I do for my ds on rainy days is get some pantry items from the cupboard (packets of pasta, noodles, small tins spaghetti etc), one of my washing baskets (uses it as a trolley) and a few green shopping bags and ds plays shops. The first time I did this he played ALL DAY, he loved it, esp when mummy would repack the 'shelves' (the coffee table and floor lol) and he could go shopping all over again

play dough is a definate must.

how about making pasta for dinner together? my ds had so much fun the other day when we made home made pasta

ummm folding clothes or playing with the pegs is a hit with ds too.

thats all i can think of right now. hope it helps