Design an A5 "Well Done!" Card Designed - Very colourful and bright!

Industry: Internet/Software
Design details: I'd like you to create a design for an A5 "Well Done" greeting card. This card will be sent to my customers when they achieve something that's really great in their business. Such as a big achievement or a clever campaign using our software.

I've not been able to find a decent 'Well Done' card in any card shops, hence wanting my own to be designed. The card will be printed using this service by SoloPress (http://www.solopress.com/greeting-cards/greeting-card-printing.html) on silk 350gsm card.

The card should be A5 in size when foldered, therefore an A4 sheet in Landscape. First half is the back of the card, the second half is the front of the card. The back of the card will have our logo, which I'll provide in AI/EPS and PSD format to the successful bidder.

The front of the card will have a VERY bold and VERY colourful "Well Done!" using styles similar to those attached to this listing. The exact text to use is "Well Done!"

The design should be fun, colourful, bold, bright, universal (so not masculine or feminine), and should use abstract shapes to fill the space. Use as many colours as you can, and it's up to you if you use white or a colour as the background. If you use a colour as the background, then please allow for a little bleed.

You're welcome to create 2-3 mockups of alternatives for me to choose from.

Thank you!
Target audience: Male and Female Business Owners
Number of pages needed: 1 side
Content on the front/back side and body: Front design to have "Well Done!" in bright and bold text
Ideas for the visual style: Funky, colourful, bright
Things to avoid: No photos, animals, flowers. The design needs to be universal.
Preferred colors: Rainbow colouring
Extra notes: