Socks~ I added some of my old socks that looked pretty new and bought some new ones to add as well. I bought 4 different styles of white ones to make it a bit more difficult. After they matched we worked on folding them into themselves.
Towels~ I have 4 of each, bath towels, hand towels and washcloths. We pretty much folded in half, in half, in half. The kids did great and some had to really concentrate to get them neat.
T-Shirts~ I bought 9 t-shirts from a local t-shirt store in our town. I did 3 white, 3 grey and 3 black. This way after folding they could group them by color. We had 3 students at each table and rotated the baskets every 10 minutes.
The month of waiting to get it all together was well worth the wait. The kids were really engaged. Even my two autistic boys, who I usually have a hard time getting interested in activities, were folding right along with the others. I love when something comes together as planned!