Where possible I use SVG for diagrams and the PNG image format for
photographs; I intend to
convert the few animated gifs to the APNG format, eventually (but the urgency
of that passed when the patents expired). Most of my SVGs
are geometric illustrations, typically used by
my pages on mathematics,
e.g. the statement and proof of
pythagoras' theorem (see margin – best used as a background image, so
that it tessellates). These are my own work – please feel free to
recirculate or reference from elsewhere, if they're what you need.
I don't own the copyright on the images listed below and don't know who
does: if it's you, please tell me and I'll gladly give due credit, or stop
using them if you prefer.
Where possible I use SVG for diagrams and the PNG image format for
photographs; I intend to
convert the few animated gifs to the APNG format, eventually (but the urgency
of that passed when the patents expired). Most of my SVGs
are geometric illustrations, typically used by
my pages on mathematics,
e.g. the statement and proof of
pythagoras' theorem (see margin – best used as a background image, so
that it tessellates). These are my own work – please feel free to
recirculate or reference from elsewhere, if they're what you need. 
me, dancing at Suffolk and
Goode (1998, I think) 
me, juggling at
craphenge 
a little version of
that 
so good I pilfered it 
