I used hard board (?) for the background and some of the flower decorations, painted it all, varnished them with spray paint and glued everything on. Here's how it turned out:
I rounded off the background with some gold paint that I just brushed all around the edges.
After spraying on the first coat of varnish, and while it was still wet, I sprinkled some glitter onto the letters. When it was dry, I varnished it again another 2 times to seal the glitter on properly.
Some of the wood cut out flowers I painted - I bought different sizes of the same flowers and glued them ontop of each other to layer them: