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[Fotios Kasolis]

For those that want to use sth generated by Octave you can use the following

u = -pi:0.25:pi+0.25;
v = u;
[u,v]=meshgrid(u,v);
surf(1.5*cosh(v/1.5).*cos(u),1.5*cosh(v/1.5).*sin(u),v,'EdgeColor','k');
view(-180,30)
axis([-5 5 -5 5 -3 3])
axis off
colormap summer

which gives a nice catenoid. Now a Gimped version of that is the following:

/Fotios