小ネタです。
ボタンをクリックするとリボンがまばたきします。

[リボンXML]

<?xml version="1.0" encoding="utf-8"?>
<customUI onLoad="rbnBlink_onLoad" xmlns="http://schemas.microsoft.com/office/2006/01/customui">
  <ribbon startFromScratch="true">
    <tabs>
      <tab id="tabBlink" label="Blink Tab">
        <group id="grpBlink" label="Blink Group">
          <button id="btnBlink" label="Blink" size="large" imageMso="Recurrence" screentip="まばたきボタン" supertip="このボタンをクリックするとまばたきします。" onAction="btnBlink_onAction" />
          <button id="btnLeftEye" showLabel="false" size="large" getImage="btnBlink_getImage" />
          <button id="btnRightEye" showLabel="false" size="large" getImage="btnBlink_getImage" />
        </group>
      </tab>
    </tabs>
  </ribbon>
</customUI>

[標準モジュール]

Option Explicit

Private myRibbon As Office.IRibbonUI
Private flg As Boolean

Private Sub rbnBlink_onLoad(ribbon As IRibbonUI)
  Set myRibbon = ribbon
  flg = True
End Sub

Private Sub btnBlink_onAction(control As IRibbonControl)
  flg = Not flg
  myRibbon.Invalidate
End Sub

Private Sub btnBlink_getImage(control As IRibbonControl, ByRef returnedVal)
  If flg Then
    returnedVal = "VisibilityVisible"
  Else
    returnedVal = "VisibilityHidden"
  End If
End Sub