To create your beach theme miniature garden use a pot or a cocoa basket, then plant larger growing plants at the edge of the garden where they can spill out. You need to leave room for your beach scene!
All images are via Miniature Garden Shoppe. Check out their entire gallery!
Cover the soil with beach sand and start designing your little piece of beachfront property. Place sea treasures here and there, and I think a Beach Dune Fence is a must. It defines the space so nicely.
Instead of blue glass pebbles, you might want to use seaglass for your beach garden.
And not every beach is all sand. Mixing rocks is beautiful too. And don't be afraid to cut plants back when they out-grow their space. It is an important part of keeping a miniature garden in shape.
Visit Miniature Garden Shoppe for more examples, tips and tutorials. What a fun weekend project this is!