You probably cannot convert pictures (like JPEG format) to a OpenDocument template (.otg). But much like in any other document, you can import pictures to it, which means you can also prepare templates with some pictures. Hence "conversion" of this kind is doable, but it is not a file conversion in true sense.
Convert JPEG bitmap image format to OpenOffice.org graphics document template.
We have found 2 software records in our database eligible for .jpg to .otg file format conversion.
Multiplatform software - convert jpg to otg on any platform
Apache OpenOffice Draw (OpenOffice.org Draw) is a fully-featured graphic editor that allows users to draw quick sketches or complex diagrams. It is easy to use and has many nice features. Draw comes as part of OpenOffice.org productivity suite.
Convert from jpg file
to otg file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jpg to otg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
LibreOffice Draw is a useful software tool for creating various drawings, diagrams and other simple graphics. It's an open source program that comes as an integral part of LibreOffice suite.