OpenSearch
OpenSearch allows websites to specify their own search mechanisms for the search bar of browsers. This means that you could search for resources from the search bar.
See the wikipedia and twitter links? This would allow OGA to be added there too.
It's as simple as this. In the <head> of all webpages:
<link rel="search" type="application/opensearchdescription+xml" href="/opensearch.xml" title="GitHub">
opensearch.xml
<OpenSearchDescription>
<ShortName>OpenGameArt</ShortName>
<Description>Search OpenGameArt</Description>
<InputEncoding>UTF-8</InputEncoding>
<Image width="16" height="16" type="image/x-icon">
https://opengameart.org/favicon.ico
</Image>
<Url type="text/html" method="get"
template="http://opengameart.org/art-search-advanced?keys={searchTerms}"/>
<moz:SearchForm>
http://opengameart.org/art-search-advanced
</moz:SearchForm>
</OpenSearchDescription>
It's even easier, actually. Create your search box with <input type="search"> instead of <input type="text"> and Firefox at the very least will recognize it and offer to add it to its list of search engines in the search bar's drop-down menu.
Chrome recognises that too. It's HTML5, so older browsers might not, but it's better than not doing it. It's much cleaner than opensearch.xml
http://rubenwardy.com/