Found some useful code to assist with embedding images as Base64. Outputs element style tag as well as image element:

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function retBase64Image($path){  $newImg = [convert]::ToBase64String((get-content $path -encoding byte))  $ext = gci $path | select @{Name="Ext";Expression={$_.Extension.substring(1)}} | select -ExpandProperty Ext  Write-Host "style='background:url(data:image/$ext;base64,$newImg) right bottom no-repeat'"  Write-Host "<img src='data:image/$ext;base64,$newImg' />" }   retBase64Image -path "C:\MyImages\Image1.gif"