My kiddos had fun doing this. We combined science with math with patterning.
We went outside and scrounged for natural items: flowers, twigs, rocks, leaves, grass, etc. Some even found some bird feathers.
Then we went inside and glued them to sentence strips, labeling the patterns like you see above. We re-did this little trick as we got into more complicated patterning, and when we extended our patterns, by using different colored fall leaves as our differences.