Random element in get_post_meta array

As the content of the meta data is actually a string (according to your comment), your code won’t work. get_post_meta(), respectively get_metadata() will only deserialize the content if it’s actually serialized.

So, if you can’t change how the data is saved, ie make sure that an actual array or already serialized content is passed to update_post_meta(), then you have to manually explode your data into an array:

$theColor = get_post_meta($post->ID, 'colors', true);
$theColor = explode(',', $theColor);

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