Here is the card I entered the other day for this challenge:
I used a Bermuda Bay card base (14.9cm x 10.5cm) then added a Whisper White layer (10cm x 14.4cm) which was stamped with the Sale-a-Bration stamp set Pedal Pusher in Memento Tuxedo Black ink.
The bike was coloured in with marker pens, Smokey Slate, Bermuda Bay, Crumb Cake, Soft Suede, Calypso Coral, Wisteria Wonder, Marina Mist, Pumpkin Pie, Crushed Curry, Real Red and Basic Black. The Bermuda Bay banner cut with Bitty Banners Framelits and was stamped with the Happy Birthday from Sprinkles of Life (don't forget for every purchase of Sprinkles of Life stamp set, $3.00 is donated to Ronald McDonald House Charities®).
It was looking a little bare, so I used the Basic Black marker to draw a rectangle (very roughly, as you can see) and added some little dashes too!
Thanks for looking!
Until next time