Teaching adjectives is one of my favorites. Every year I have my students complete a worksheet called "Kiki's Kitty" in which they have to come up with an adjective fore every letter of the alphabet.
I allow them to use their dictionaries if they are unable to think of an adjective. The results are pretty hilarious.
After they completed this worksheet, I had them make acrostics with their names. They had to think of an adjective for every letter in their name. Again, I let them use their dictionaries if they couldn't think of one.
Again, excellent results.
Overseas Adverbial Alight
Irate Nice Multilateral
Ornamental Angry Innocent
Eligible Naughty Thinker
Yellow Nice Asian Lover Songs