While I do like your sign blanks, I have been taught to make the shape of the sign fit the layout, not the other way around.
I would seriously consider losing the decoupage elements and trying to find suitable clipart to cut.
I would also recommend not running all the lettering to the edges of the signs.
Choose what you want to stand out (probably the street number) and highlight it in some way.
Here I used a panel.
I chose the most confusing of your examples to redraw.
Hopefully I have it in the right order. My fonts are all a bit thin.
You might also want to consider the use of smalts (tiny glass beads) or learning to apply gold leaf. That could really increase the selling price of your signs after you learn to do simple effective layouts.
The second pic is one using an HDU sign blank purchased from a member here.
I used both matte and gloss paints, gilded gorilla glue, and smalts.
Love....Jill