we've got ds2 a pat mat - the type you fill with water - and some stacking blocks that have rattley things in them - and that's it!! He loves messing with paper, so I'm sure he'll be happy enough on the day..!
we've been having quite considerable problems with ds1 being hugely jealous of ds2 - snatching toys away from him, not sharing stuff, the odd pinch/shove... So we've started a sticker chart, which is going reasonably well - a gold star every time he shares a toy or does something nice for ds2, and one taken away every time he's horrible to him! 5 stars = a present... He's already earned himself a Thomas train (all he ever wants!) and ds2 is suffering less as a result! My only worry is how do you get them to do it without the chart/promise of presents - he'll be bankrupting us soon at this rate...!