To make this little bobble heart I drew my basic shape. When working out your shape you need to remember that you need a double crochet (UK terms) after each bobble and a row of double crochet in between rows of bobbles, so on the diagram below each shaded square represents a bobble and each white square represents a double crochet.
You can do all sorts of shapes, provided you keep them reasonably simple.
My hot water bottle cover was worked in the same way only with a bigger heart. The colour change for the bobbles looks more ambitious than it really is.
And that's it! All you need to do is make sure you keep count, so probably best not to watch the scything episode of Poldark while you're working your shapes.
Hope all is well out there ...