DD (almost 12) is also ASD.
She quite liked the CoderDoJo programming system (free to download I think).
She has a range of fluffy and fleecy and harder cotton cushions in her room - a mix of textures seems to be what she wants. And soft fluffy blankets to snuggle under both in the sitting room and her own room.
She also still has a load of ducks and boats and her original stacking cups for the bath (baths are sometimes much needed as a calm quiet place to restore herself) - we replace the ducks etc every couple of years (the insides get slimey - yuck!) and Santa has brought a few of those sets. I know I got some in Tiger, but I have also gone to JoJoMamanBebe for baby squirty toys too. And bubbles, things like bath bombs from Lush and nice smelling shower gels (lavender ones are great) are also handy stocking fillers.
She really loved the notion of those aliens in a egg who are surrounded in slime, and there was no way I was getting one - it was great when Santa brought it when she was 10. Recently, as that one had dried out, her play therapist had suggested using the alien to throw at the wall as a safe "venting" and "using up energy indoors" mechanism, just wash off the goo (so we've bought a new one).
YYY to the various putty suggestions.
Also, she quite likes different lighting. She has battery operated sets strung around her bed for low level coloured lights, and a small one that changes colour on the other side of her room. I keep meaning to get her a lava lamp style one, as she does like watching those at times, or a bubble lamp. Specialist shops, like Learning Space can give great ideas for sensory items, but you could get lots in places like Ikea or general toy, DIY, lighting or design/décor type shops too.