Alphabet Coloring Pages - great idea for baby shower! Print all the letters on cardstock or heavier paper. Have guests color the pages anyway they like and sign a message for baby on the back. Have the pages laminated and bound into a keepsake book!
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!