playdough
pom poms
magnets
stickers
flat glass beads
do-a-dot markers
bingo daubers
You can also have the children roll a dice and cover up the same number of circles on the mat for a roll ... count ... and cover activity.
Always remember to use supervision when using small items with children under the age of three and those still in the stages of putting items in their mouth.
You can grab the owl cover-up here and if you get a chance let me know what items you would use with this activity by leaving a comment.