First and foremost in the world of DIY fitness and homemade gear is the sandbag.
The sandbag is so cheap but extremely useful when it comes to training in a hardcore fashion.
Make a Sandbag usingthis great PDF explaining how.
For some ideas for training with sandbags:
Sandbag Training Routines
Sandbag Training Routines For an alternative to kettlebells - for the odd session or two check out this video by Josh Henkin. Here Josh explains exactly how you can make up your own sandbag training routine. ...