Sorry if it's not a direct answer, but I can suggest you try inkscape instead. Of course it's a much more powerful program, and that comes with it being possibly a bit harder to grasp and definitely different from publisher, but it should be very easy for a beginner to make a simple birthday card collage.
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I think inkscape is a better solution as well. Draw has some limitations. However you can use Inkscape to create this borders you want, and then load It in Draw, If you find yourself more familiar with Draw
What about a background svg image and text area(s)?
This.
If you still have access to Publisher, you can make a document that includes all your favorite border styles in Publisher, save (as PDF?) and then copy out the border images in LibreOffice.
However, there are also lots of sites where you can download free SVG background images and patterns, e.g. [openclipart.org)[https://openclipart.org/detail/260278/flower-seamless-patternremix].
I'm pretty much a superficial user regarding office programs, particularly draw. However, I did want to have borders around my text recently, and found you can insert a single celled table with the border you want.
Would a worse hack with a single celled table in a single celled table (different border colors) do the trick for you?