Due to high popularity of Wordpress and millions of website are being hosted and implemented with Wordpress, there was scenario of creating free Wordpress theme or template and giving away it free for use for websites with link to their website as return.

If it is done with the websites which are relevant to your site it gave good effect for getting high quality links but as people have used it excessively it is started being considered as spamming. So does anyone have real experience based on this? Does anyone get bad or good impact using this kind of methods for link building?