Positive variant of "taint"
You might consider enrich. Like enhance, enrich means to increase the value of something. Dictionary.com offers this definition:
to make finer in quality, as by supplying desirable elements or ingredients
While enhance is positive and fits the context, I feel that enrich more aptly conveys the idea that not only are you steeping your life in positive things, but also that you personally value the opportunity to do so.
Taint doesn't imply that you want to besmirch your life or that you value doing so, but it does suggest a stain caused by deep soaking -- I feel enrich conveys the notion of "soaking yourself in something" better than enhance does.
I like imbue.
http://dictionary.reference.com/browse/imbue
imbue
verb (used with object), imbued, imbuing.
to impregnate or inspire, as with feelings, opinions, etc.: The new political leader was imbued with the teachings of Mahatma Gandhi.
to saturate or impregnate with moisture, color, etc.
to imbrue.
Note the very close and etymologically related word "imbrue" as the third definition, which literally means "stain". As such, this suggestion might be closest to what you seek.
I think "infuse" would work well.
transitive verb: to cause to be permeated with something (as a principle or quality) that alters usually for the better
Color?
As a verb,
to give a special character or distinguishing quality to
and borrowing connotation from the noun form
details in description, customs, speech, habits, etc., of a place or period
To me, taint brings to mind discoloring, perhaps from the similarity to tint and paint, although that might just be a personal bias.
suffuse
to gradually spread through or over
Usage is mostly past tense (suffused), and tends to refer to a soft introduction of light and colour.