As we´ve been renovating our new house, I also had some concrete and some time left over.
I made some concrete vases with plastic cups as moulds, it´s pretty easy you gotta try it!
So what you need:
plastic cups in two sizes
something strong to stir, I used a little shovel
stones as weight
Mix concrete and water following the instruction given on the concrete bag. Wear gloves and a mouth protection so you do not breathe in the dust! Mix until it has a doughy consistency.
Pour the concrete in the bigger cup, so it´s round about 60% full, and push in the smaller cup. The smaller cup needs to stay in place so fill it up with stones, gravel, whatever you have on hand.
Make sure everything is where it´s supposed to be and let it dry.
So now comes the hard part. Wait at least 24hours before you get the vases out of the mould.
Trust me. Get the small cup out and than peel off the big one.
Voila! You got some cute vases. They look good in the garden and inside!