Squishy Bag - A tactile/multisensory approach to pre-writing and writing skills. Things you need - Gallon size Ziploc bag, glitter (optional), food coloring, hair gel (dollar store) I like this better than paint.
For class word wall: A couple white sheets, a note sent home instructing mom to dress the kids in colorful clothes, and a ladder (and a photographer who is not afraid of heights! So fun! You could also do shapes.or spell out the name of the school!