I personally loved this one and saw this on Pinterest or Instagram somewhere. It's so cute and great to put up in the house later :)
You need white paper, a marker, glue and some flowers.
Draw a lion face with a black marker in the middle of the paper (see picture below for the example).
Put glue around the face (this will be the mane)
Stick all of the real flowers you have collected around the face! (Yellow flowers works great here). Let your little one's cute hands help for this part :)
And ta-da! Super cute right?