Looking for ideas on mixed drinks to make for my uncles birthday

Picked this up and was wondering what would go well with it. We have access to pretty much most of the liquors and quite a bit of juice and seltzer. My uncle always makes the drinks and I thought it’d be fun to surprise him and make him one but I have no idea how to use it nor do I have experience making new mixed drinks. I’m going to be adding two capfuls of the watermelon lemonade concentrate per drink. I’m thinking vodka and/or blue curacao??

Hope this is the right sub sorry if I’m in the wrong place