To make it work, uncompress the breeze icons resource and kexi icons resource (http://kexi-project.org/tmp/breeze.rcc.bz2, http://kexi-project.org/tmp/kexi_breeze.rcc.bz2) to PREFIX/share/kexi/icons/. Both files have dirs such as "icons/actions/32" etc. just like any XDG-compatible theme should have.
Kexi with properly working icons (both the generic Breeze icons such as edit-paste.svg, and Kexi's own icons such as form.svg):
{F94056}