I truly enjoy cards with stamped panels about the size of an ordinary business card. The small "canvas" allows for a simple, clean layout and strong focal point, with lots of glorious white space to form a mat.
Getting creative with white matting just adds to the beauty without cluttering the design or distracting from the focal point.
The Stunning Cosmos set from Altenew has these gorgeous layered flowers which allow for wonderful play of color. Four stamps make up this image: the petal base, the petal veins, the flower center, and the center details. This set is relatively easy to line up, especially if you use a MISTI.
Note that I stamped the flower on a larger scrap in the MISTI and cut it down for the card. This allows plenty of space for the magnet bars to hold the card stock in place in the MISTI. I stamped the sentiment after cutting down the image so it would be positioned properly on the panel.
The sizes of the mats match the Proportional Matting Chart I posted eight years ago, with increments of 1/8" between those listed on the chart. The chart allows your panels to fit on a standard 4.25" x 5.5" sheet card (American standard...other countries cut card stock differently!)
Another snippet of advice. I used Papertrey's heavy white card stock for this card, but when you're going to add so many mats, it's better to use Neenah Solar White 80lb for the stamped panel and mats and Neenah Solar White 110lb for the base. Unfortunately, in my design process, cards usually evolve mats...they aren't planned in advance. Papertrey doesn't sell a lighter-weight version of its card stock, and the two brands are not the same white or the same texture, so mixing and matching offends my obsessive need for order and perfection.
Alas, first-world problems.
Mercy, grace, peace, and love,
stamps: Altenew Stunning Cosmos, a Hero Arts sentiment
paper: Papertrey white
ink: Hero Arts pale tomato, red royal, butter bar, charcoal; Archival black