I love this ladybug feeder. Apartment therapy has instructions to make it and it is a great thing to have in the garden or yard. Ladybugs eat aphids mealy bugs, scale, leaf hoppers, and other destructive pests so if you can attract and keep them around aphids will be a few less pests that you will spend the summer fighting off your tomatoes and roses. I really like that she tells what to put in the feeder so the ladybugs can eat in case the aphid count is low so the ladybugs won’t starve.
http://www.apartmenttherapy.com/how-to-make-a-ladybug-feeder-attract-them-to-your-garden-169681