You'll need:
A bag of sand/cement mix (a 40g bag makes four pavers), or concrete mix.
9mm-sheet MDF (900mm x 600mm makes two bases)
A length of 50mm x 50mm radiata pine
Oxide in your choice of colour
Garbage bags
Fine chicken wire

Tools:
Wire cutters
Wood screws
Trowel

Here's how:
1. To insert pavers into an area that's already paved, make the mould the same size as the slabs or a size equal to a number of the smaller paving units. If they're for stepping stones, make them any size you like. We made ours 350mm x 350mm and the finished pavers each weighed 10kg.

2. To make the mould cut the MDF or form ply to size plus 50mm all round for the sides. Cut the 50mm x 50mm pine into the four lengths needed to make the paver of the desired size.

3. Wrap the base and each of the four pieces of pine in plastic. Do this tightly so there are no wrinkles. Secure with sticky tape. Screw the wrapped lengths of pine to the MDF and to each other to make the mould.

4. An easy alternative to a made mould is a bought container such as a plastic washing up bowl. These come in round or rectangular shapes and their outward sloping sides make it easy to turn out the finished paver. If uniform thickness of paver is essential, just be sure to use exactly the same amount of material for each paver or scratch a level on the inside of the bowl.

5. To decorate the surface, anything which can be set in cement can be used such as shells, glass nuggets, pebbles, tiles, broken tiles or china. You could even make fake fossils with leaves or fish frames. You can scratch patterns into the surface or print a message. The more you think about it, the more ideas will come to you.

6. To make a paver using round objects, such as pebbles, shells or glass beads, you will need to place the surface decoration in the bottom of the mould and pour the cement over them. (For flat objects like leaves or tiles, these will need to be pressed into the top surface of the wet cement or grouted on later, when the paver is dry). Line the base of the mould with the objects, closely spaced. To stop cement from running under the objects and spoiling the surface and also to hold to objects in place when the cement is poured, sprinkle a little sand between them. A soft paintbrush will help you distribute sand evenly.

7. In a bucket combine the sand and cement mix with a little water to make a stiff mix. It can be easier to mix a small amount, then add more sand/cement and water; a metal bricklayer's trowel will help. To colour the pavers, add a little oxide to the mix.

8. Gently pour half the wet cement into the mould. Be careful not to scatter the decorative objects. When the mould is half full, press a piece of chicken wire cut to size into the cement then fill the mould to the top. The wire gives the paver strength. Smooth out (screed) the surface with a piece of straight edges timber. Let the paver set for at least 72 hours. Check if it's ready to turn out by running a fingernail across the surface. If the cement crumbles, it's not ready and needs more time to set.

9. To unmould, gently tip over onto a soft surface such as grass. If the paver won't come out easily, let the mould fall over onto its face. You may need to scrub off excess cement from the face of the paver.

10. For pavers decorated with tiles or mosaics, make the paver then set the tiles on top with construction adhesive. Leave for 24 hours before grouting. This gives a neater finish than using round objects.

11. To make a fossil, make up the paver and gently press a leaf into the surface of the wet cement. Big, distinctive leaves, like those of a liquidambar or fern, are best and you should leave them in position until the paver has set. Then either carefully remove the leaf or just let it weather away.

12. To engrave a message in a paver, wait until the cement has firmed but not fully set. With a ballpoint pen, engrave your message. It can be as simple as "welcome" or perhaps a favourite saying or line of poetry. If you're feeling creative, you could make up something that expresses your feelings about the garden. When you've decided on the inscription, write it out on a piece of paper the same size as the paver to check it fits.

Source: Better Homes and Gardens TV