I started by taking some chipboard numbers, colouring them with a black Promarker and then embossing multiple times with black embossing powder then ultra thick embossing powder. They proved very difficult to photograph because of reflections but you can see them a little better here:
The zigzags are from the Chevron set of stamps by Uniko Studio, stamped in Versamark then embossed in Wow Detail Clear embossing powder. The greeting, a long-retired stamp by Elzybells, was treated in a similar way. There seemed to be too big a gap under the greeting so I filled it with a plain black brad.