One, a photograph printed on canvas, shows a storm apparently heading for calm shores.
There is no doubt that since taking office on August 25 Mills has overseen a whirlwind of activity, and more changes are to come – some of which appear very likely to have an impact on the region's hospitality industry.
Seated in a dark leather chair in his office, which overlooks Darwin Harbour, he says he has most enjoyed making decisions.
"That is the most important part of it and I enjoy that the most, because that is what it is actually about - making careful decisions, but making them swiftly," he says.
Controversially, Mills has sacked several senior public servants, talked about possibly scrapping maximum speed limits on major roads in rural areas, and dumped a program designed to stop problem drunks buying takeaway alcohol.
He has also begun dividing amalgamated government agencies, which he describes as "mega departments", into smaller units that he says will be more efficient.
Mills says the toughest decision he has made since taking office was deciding who would fill key positions in the public service.
Critics say he's drawn the knives on public servants who were seen as too close to the former government.
The replacements so far include former CLP president Gary Nairn, a former Liberal Party federal MP, and Bill Freeland, who ran the environment department under the last CLP government.
"I really feel for people who were affected by that decision, but I've learned enough to know that my job is not about subjectivity," he says of the sackings.
A former wheat and sheep farmer, 54-year-old Mills is an unlikely politician.
He grew up on a farm in a remote part of Western Australia, but drought and low wool prices saw him leave the land in the late 1970s.
He became a mature-age student and trained as an educator, working as a primary and then a secondary school teacher, which brought him to the NT.
"I grew up isolated. I grew up having to live off the land and having to run a small business," he says.
He remembers his father having friendships with Aboriginal people in a time and place where "real" friendships were unusual between indigenous and non-indigenous people.
"I grew up in a household that was a bit different to many around," he says.
"That has been the most important thing, and feeling that I am an Australian and part of an important Australian story."
Mills has led the NT's Country Liberal Party (CLP) out of the wilderness, where it had languished since the Labor Party won power in 2001.
Last month's landslide win, in which the CLP took 16 seats in the 25-seat Legislative Assembly - double Labor's total - was not predicted by pundits and came largely on the back of a huge swing in votes by indigenous Territorians.
It was unprecedented that bush electorates could decide power in the NT, and it shattered perhaps forever the view that only Darwin's northern suburbs really mattered to politicians seeking re-election.
Condescending attitudes that people out bush didn't really follow politics went out the window.
It is clear the plight of the territory's most disadvantaged indigenous residents is close to his heart.
"I think under Labor there has been a lot of division," he says.
He is opposed to the way the federal government's intervention in Aboriginal communities has operated under the Labor government and thinks the large signs outside remote communities reminding visitors that pornography and alcohol are banned are demeaning.
"I am not saying I have a magic wand or anything like that, but at least involving people in problem solving in a respectful way we can make massive gains," he says.
His other great passion is Asia, more specifically Indonesia.
Already one of his ministers has travelled to Indonesia, and it will also be his first overseas trip as chief minister.
The NT plans to send a full-time envoy to Jakarta, and the Indonesian-speaking chief minister also wants school students to learn the language and culture.
"There will be a strengthened focus on Asian languages, with a specific focus on Indonesia," he says of his plans during the next four years.
