The poorly-named Tubthumper is a faux terracotta pot that has double functionality of a standard planter and speaker housing. Just add soil and seeds to the top of the planter and watch the shrubs go. Then run the speaker wire to your home audio system to get some block rockin' beats that you and your plant can enjoy together. The housing is waterproof, also.
So there is no fear of ruining your speakers by watering the petunias. Each individual Tubthumper is available for around $175.
Tubthumper is a Speaker Disguised as a Plant Pot [Chip Chick]