Some novel garage speakers using plastic gas cans and a 2-way speaker kit. Standard 5L/1.25gal gas cans fit a 2-way 6.5" woofer/tweeter kit perfectly. As an added bonus, the pour spout serves to release pressure in the speaker can. You can get everything you need for ~$69 from Amazon and/or Home Depot.
If you don't have anything to plug the speakers into, here's my approximate setup: