I used my Up, Up and Away stamp set from Papertrey Ink, along with some scraps of Stampin' Up paper I had left over from Sale-a-Bration in 2017. These cute hot air balloons fit the theme of this card so well! (Stampin' Up also has a great hot air balloon set called Lift Me Up, which could be used to create a similar effect.)
I used a standard A2 card base cut from Night of Navy cardstock (4 1/4" x 11" scored at 5 1/2" on the 11" side). The interior "tunnel" is created by scoring a second piece of Night of Navy cardstock cut to 4 1/4" x 11" and scored every 2 3/4". I die cut an oval "tunnel" by centering my die on the center score line, and then folded the paper in a mountain configuration ( _/\_ ) and adhered the far left and far right panels to the outer card base. Be sure to decorate the interior of your tunnel before assembly; I used a 5 1/2" piece of patterned paper scored at 2 3/4". The side panels were cut to 2 1/2" x 4" (coral layer) and 2 1/4" x 3 3/4" (clouds).
By adhering balloons both inside and outside this card interior, I created a dimensional effect. Some vellum clouds are fun additions too!
I hope you'll check out Heidi's tutorial and try this fun card fold for yourself. A variety of scenes would be amazing: gardens, houses, critters, ocean scenes … the possibilities are endless!