Yes, you certainly can. I did not use up all the lychee and pineapple cubes from the can. I used some as a garnish when serving the jelly. You can add as many fruits as you wish, but do take note that too many fruits in the jelly can cause the jelly to break easily when transferring out of the cake pan. You can also use different types of fruits for this jelly, like in my nata jelly here.