If you are having difficulty getting inspired, look for card maps and don't be afraid to experiment. It is only paper (GASP). I have a Pinterest Board called Card Maps, click HERE.
This is how I begin - I have a envelope filled with blank cardstock in an array of sizes. I used inexpensive cardstock and each piece of paper has the measurement written on them.
I begin with a blank canvas - THE CARD BASE. I pull out different sizes to see which fits best for the design.
I then begin to start layering using pieces from my envelope.