As said, I like them

and as you said, he's indeed right, but his sarcasm was not right.

May I ask you to do the full set ?

Pen
Eraser
Highliter
Hand
Ruler
'T' (or A) for Text
Undo
Redo
and the Color Selector.

So it's only missing Ruler, Text, Undo and Redo.

I'll try to implement support for icon themes in Xournal soon. Just give me a name for your theme.

And again, thank you !