I've never tried lilac jelly. I'm curious now. I really like floral gem candies, so I would probably like lilac jelly.
When cleaning out my freezer last week, I found two ice cream buckets of strawberries mixed with sugar ready to be made into jam. I made the jam today and have 7 pints cooling on my counter. I used the long boil method which is tedious but makes a delicious jam with more fruit than sugar.