I really like the 'heart' aspect of the pattern. Your design's coloured border is pretty neat too.

Unfortunately this technique works best on fairly large graphics. Your 400pix square image is likely too small eh? I noticed when I reduced mine too small the 'lines' break up just as I see in yours.

Regards, Ross

PS - Risto: Of course you are right. Every technique you explore with this program adds to your understanding of how it works. Discovering for yourself its capabilities and limitations, you can effectively make its tools into your tools - responsive to your creative impulses.