I adore the simple things in life. I think concrete planters are beautiful. In one afternoon, I created several beautiful planters that could also function to best fit your needs.
1 tub/bag of concrete (1 tub was $7)
Multiple lightweight plastic containers or milk cartons
Build your planters, cups, bowls or other items to size. I used multiple juice boxes, recycled plastic and more to create various depths and widths. In a disposable bowl or cup, mix together your cement and water based off the package instructions. Pour into your designed container and let dry in the sun for 3 or more hours, based on the size.
Lastly, Brody helped me plant beautiful succulents into my planters. He's so helpful.
Another option is to paint the planters.