Equipping one of the icons results in a colorful trail when Homeguard is active – AND you get similar cool effects during the carousel and when dashing toward loot orbs in TFT as well:
These are only available in the store (for only 1 BE!) until 2020-07-01T06:59:00Z … Also note that the effects will disappear at the end of June, but of course, the icons are usable forever.
and the sparkles are 
!