Commemorative items we've had over the years:
Teatowels - my children love to see their old school ones and the dogs like to carry them about...
Key rings - always handy to attach to dog bags even if you don't need them for car or house keys
Mugs - I only really like bone china :)
Ring clips - I prefer arm bands for numbers but I know a lot of people prefer clips and they are handy for wearing rosettes too
Boot bags - these are generally the small 'gym bag' but are v useful for wet beard cloths, brushes or just keeping things separate inside a bigger bag
Flannels/beard cloths - I use a lot of these and they're great emergency towels or wipes on wet or muddy days
Coasters - shame to have just one...
Mouse mats - brilliant, I always like a new one every year as they do get grubby
Magnetic photo frame - my sister in law got these printed for their school last year and they are a fabulous idea, a friend gave me a plain one for Christmas and I'd happily have a few more!
Hope this helps :)