The moisture-retaining kitty litter bucket planter
The 40lb cat litter buckets make EXCELLENT pots. If you use a 1/8" to 1/4" drill bit and drill two holes on each side about 2" to 3" from the bottom of the bucket enough water can sit there to help retain moisture when the bucket is filled with potting soil. So far I have made 3 and planted some 'volunteer' tomatoes that randomly grew in my garden. I'm short on space, so I decided to experiment with what I had to plant them in and came-up with the water-retaining kitty litter bucket planter.
In this photo the 3 you see don't need watering nearly as much as the 5-gallon Miracle Grow bucket to the left. The Miracle Grow bucket has holes right on the bottom and water doesn't retain nearly as well. We'll see how water is retained when the younger tomato plants grow larger in these kitty litter buckets.
If you have several cats, as I do, then I recommend the kitty litter sold at Sams Club. Their less expensive brand clumps well and covers up cat stench well. They cost less than $9 for 40lbs and over time you will have quite a few buckets. Don't throw them out.. use them as moisture-retaining planters. You could probably paint nice graphics on the sides also for an attractive look. Just thought I would share my simple idea that is working well for me (and the price is right).