Hello :)
I'll migrate all content (articles, categories, images, users, K2/Kunena etc.) from Joomla 1.5.26 to the new version, but you need to buy/design template for new Joomla.
It's not possible to use the template from the older version and, unfortunately, I'm not Joomla templates designer.
Let me know if you have any questions :)
Kind regards,
Adam