It's probably not what you meant, but here you go Ert!
<Item name="Cake Orb" useableWith="triggered" requirements="" endsStatus="Levitating" addsStatus="Heavy" grantsAtk="" consumedAfter="999" fxLast="10" hpPlus="999" pspPlus="999" maxHPPlus="999" maxPsPPlus="999" spdPlus="-999" dodgePlus="-999" strPlus="999" perPlus="999" psyPPlus="999" psyDPlus="999" prcResPlus="100" slshResPlus="100" crshResPlus="100" mnResPlus="100" htResPlus="100" cdResPlus="100" ltResPlus="100" shResPlus="100" poiResPlus="100" ctrLimitPlus="-999" commonality="1" image="Cake Orb" description="It's just yummy!"></Item>
<Item name="Cake Orb 2" useableWith="triggered" requirements="" endsStatus="Levitating" addsStatus="Heavy" grantsAtk="" consumedAfter="999" fxLast="10" hpPlus="999" pspPlus="999" maxHPPlus="999" maxPsPPlus="999" spdPlus="-999" dodgePlus="-100" strPlus="999" perPlus="999" psyPPlus="999" psyDPlus="999" prcResPlus="100" slshResPlus="100" crshResPlus="100" mnResPlus="100" htResPlus="100" cdResPlus="100" ltResPlus="100" shResPlus="100" poiResPlus="100" ctrLimitPlus="-999" commonality="1" image="Cake Orb 2" description="It's just yummy!"></Item>
Put the image in "Telepath Tactics/Data/UI/Item Icons" from your installation directory, and add the line of code from above to the ItemClasses.xml file of your choice!
~Edit~
I made an alternate version of the Cake Orb to better reflect the image you linked to! Sorry that I'm a terrible pixel artist!
(I'm really having fun with this whole "Modding" thing!)