LIttle biro sketch on notepapers, into GIMP to tidy it up and then into inkscape to vector using edge detect. I’m getting quicker at it!
I’m having fun playing with the filters and gradient fills on GIMP.
In the HitchHiker’s Guide to the Galaxy, the Infinite Improbability Drive turns a bowl of begonias into a friendly whale.
(It looks like the ebook of HitchHiker’s guide to the Galazy is freely available here: http://www.readanybook.com/ebook/the-hitch-hiker-s-guide-to-the-galaxy-264)