To add a level of difficulty. I would add number cube to see how many letters to cover up at a time. Use tally marks, dots, numerals ect Free "find the letter" alphabet worksheets! Get them for uppercase, lowercase, and both!
DIY Kids Craft - Paint With A Styrofoam Cup. LOVE teaches kids what color, two combined colors can make. Inspired me to add two different paint colours to either side of a butterfly (paper folded in half).