<font face="Arial, Verdana" size="2">I remember somebody mentioning a work around, but I cannot find the exact post. Basically you need to create a custom formatting tag. </font>Name it something like {img}. Make the start html <im<font face="Arial, Verdana" size="2">g src=' and the end html '/> then to insert an image in to your custom slides you need to type {img}path/to/your/image{/img} you could also set the style attribute to position it.</font>
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<font face="Arial, Verdana" size="2">The other option would be to create a presentation using Libre Office, or PowerPoint and either have that running from with in OpenLP (or particularly on mac) you could use the "Show Desktop" option on the live controller and run the presentation outside of OpenLP.</font>