[O] pop-up flashing box using org-timer?

I'm using org-timer via "C-c C-x ;" and setting it for 30 minutes for a repetitive job that I'm doing. When it ends it has a small popup which shows its ended but that soon disappears. Is it possible for it to show a flashing popup that will show even if I'm not an org-mode buffer? Like in the

Re: [O] pop-up flashing box using org-timer?

Sharon Kimble writes: > I'm using org-timer via "C-c C-x ;" and setting it for 30 minutes for a > repetitive job that I'm doing. When it ends it has a small popup which > shows its ended but that soon disappears. Is it possible for it to show > a flashing popup that