I decided on a technique which I haven't used for a while, iris folding, it takes time but I find it very relaxing. Here is a simple guide to iris folding.
Trim down to lengths which overhang the edges of your aperture(s).
Fold one edge over of each strip.
|Inside/back of aperture|
|Front of card.|
And your finished card should look something like this.
Creata Aperture Card
Creata Patterned papers
Creata Mirror Board