I have already presented some ideas for jars with layered contents (see also the links below) and I find the sand art succulents also great :)
By the way the succulents are not real.
Links:
Sand Art Succulents (DIY Sand Art and Painted Succulent Terrariums)
via: DIY Sand Art & Succulent Terrariums
Here at unikatissima:
Coloured Sand Jars
Paint Coated Beans
Cake Mix in a Jar (okay, this is to be eaten, not to be looked at ;-))