A few short comments on the topic of biomimetics and design.
Quotes and comments;
1. "Nature has one very big advantage over any human research team: plenty of time.  Billions of years, in fact.''  [1.]
- There may be some truth to this if we restrict ourselves to dealing with an earth that has living organisms on it, but before this occurred it seems to me that time (if anything) would have been a disadvantage. i.e. wouldn't it have merely led to ever increasing disorder based on the effects of entropy? Doesn't 'nature' display the effects of entropy over time if there are  no life forms to 'counter' this effect? Let's think of Mars. Let's assume there are no living organisms on (or in) the planet. Would anyone expect such forms to 'emerge' in the future? Hasn't the planet become more and more inhospitable over time?
2. “Nature ... often has to make do with whatever is readily available  locally, and whatever structures have been created through the lengthy  trial-and-error of evolution.”
- I'd note that this is not an observational statement. No one observed  these structures (eg. diatoms) being produced by trial and error over  aeons. (Isn't science supposed to be anchored in observation?)
3. "It all comes down to assembling complex structures from small, simple building blocks, Buehler explains.
- The person who rejects ID has to assume this 'assembly' of complex  structure happens solely by chemical reaction. In my opinion most such  assembly processes require a blueprint in the form of genetic code, and  that this code needs an intelligent source.
4. “Buehler suggests that just as biology has done, humans could  engineer materials with desired properties such as strength or  flexibility by using abundant and cheap materials such as silica, which  in bulk form is brittle and weak.”
- Biology isn't a person, and hasn't engineered anything. (One reason I  reject materialism is that even atheists find it almost impossible to  even describe what they see without resorting to reification and  anthropomorphism.) So if 'biology' didn't engineer the diatom (etc.) who  or what did? The e. can't expect to escape this dilemna by resorting to  sloppy language and personalization.
Summary;
I guess we have to say that if our brightest engineers can't yet duplicate 'nature' then the source of the life forms on this planet is more intelligent and wise than all of them combined. (It's my hunch that this source is personal, and not impersonal.)
Notes;
1. Biomimetics: Does It Flatter Darwin?     Creation/Evolution news  10/24/2010  
MIT news; ''Nature has one very big advantage over any human research team: plenty of time.  Billions of years, in fact.  And over all that time, it has produced some truly amazing materials – using weak building blocks that human engineers have not yet figured out how to use for high-tech applications, and with many properties that humans have yet to find ways to duplicate."